New Gran Colombian ships for 1910

[The Rock Doctor]

Let us start...modestly.



The river gunboat Gorrion is designed as a support vessel for troops fighting close ashore.  A squat, boxy vessel, she carries two 120 mm mortars amidships, the forward unit offset to port, the aft unit offset to starboard.  Both mortars are surrounded by a ring of armor plate.

The usual 47mm QF and machine guns round out the battery, and can either work over targets ashore or small craft on the river.  The boat is armored against typical light artillery fire.

Two units are planned for 1910, being built in sequence at Manaus.


Gorrion, laid down 1909

Displacement:
   463 t light; 480 t standard; 512 t normal; 537 t full load

Dimensions: Length overall / water x beam x draught
   164.04 ft / 164.04 ft x 32.81 ft x 5.12 ft (normal load)
   50.00 m / 50.00 m x 10.00 m  x 1.56 m

Armament:
      2 - 4.72" / 120 mm guns in single mounts, 52.72lbs / 23.92kg shells, 1909 Model
     Muzzle loading guns in deck mounts
     on side, all amidships
      2 - 1.85" / 47.0 mm guns in single mounts, 3.17lbs / 1.44kg shells, 1909 Model
     Quick firing guns in deck mounts
     on centreline ends, evenly spread, all raised mounts
      2 - 0.31" / 8.0 mm guns in single mounts, 0.02lbs / 0.01kg shells, 1909 Model
     Machine guns in deck mounts
     on side, evenly spread
   Weight of broadside 112 lbs / 51 kg
   Shells per gun, main battery: 100

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   1.97" / 50 mm     90.22 ft / 27.50 m   6.89 ft / 2.10 m
   Ends:   0.98" / 25 mm     73.79 ft / 22.49 m   6.89 ft / 2.10 m
   Upper:   0.98" / 25 mm     90.22 ft / 27.50 m   5.91 ft / 1.80 m
     Main Belt covers 85 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.98" / 25 mm   0.98" / 25 mm            -
   2nd:   0.98" / 25 mm         -               -

   - Armour deck: 1.57" / 40 mm, Conning tower: 1.97" / 50 mm

Machinery:
   Coal fired boilers, steam turbines,
   Direct drive, 2 shafts, 300 shp / 224 Kw = 10.18 kts
   Range 1,250nm at 10.00 kts (Bunkerage = 58 tons)

Complement:
   53 - 69

Cost:
   £0.030 million / $0.120 million

Distribution of weights at normal displacement:
   Armament: 14 tons, 2.7 %
   Armour: 233 tons, 45.6 %
      - Belts: 102 tons, 19.9 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 9 tons, 1.8 %
      - Armour Deck: 120 tons, 23.5 %
      - Conning Tower: 3 tons, 0.5 %
   Machinery: 15 tons, 2.9 %
   Hull, fittings & equipment: 177 tons, 34.7 %
   Fuel, ammunition & stores: 49 tons, 9.5 %
   Miscellaneous weights: 23 tons, 4.5 %
-10 t:  Wireless
-13 t:  Weight reserve/deck cargo

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1,877 lbs / 851 Kg = 35.6 x 4.7 " / 120 mm shells or 1.8 torpedoes
   Stability (Unstable if below 1.00): 1.27
   Metacentric height 1.4 ft / 0.4 m
   Roll period: 11.5 seconds
   Steadiness   - As gun platform (Average = 50 %): 100 %
         - Recoil effect (Restricted arc if above 1.00): 0.09
   Seaboat quality  (Average = 1.00): 1.50

Hull form characteristics:
   Hull has raised quarterdeck
   Block coefficient: 0.650
   Length to Beam Ratio: 5.00 : 1
   'Natural speed' for length: 12.81 kts
   Power going to wave formation at top speed: 37 %
   Trim (Max stability = 0, Max steadiness = 100): 71
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      8.86 ft / 2.70 m
      - Forecastle (20 %):   5.91 ft / 1.80 m
      - Mid (50 %):      5.91 ft / 1.80 m
      - Quarterdeck (25 %):   13.78 ft / 4.20 m (5.91 ft / 1.80 m before break)
      - Stern:      13.78 ft / 4.20 m
      - Average freeboard:   8.11 ft / 2.47 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 36.2 %
      - Above water (accommodation/working, high = better): 87.5 %
   Waterplane Area: 4,123 Square feet or 383 Square metres
   Displacement factor (Displacement / loading): 128 %
   Structure weight / hull surface area: 34 lbs/sq ft or 166 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.95
      - Longitudinal: 1.71
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is excellent
   Room for accommodation and workspaces is cramped
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

[The Rock Doctor]

Four dispatch boats - as posted at: http://www.navalism.org/index.php?topic=1852.0 - are envisaged for 1910 construction.  No need to double-post them.

[The Rock Doctor]

The Grenada class protected cruisers are an enlarged version of the Westmoreland class ships.  The class features 50/50 oil-sprayed coal-firing and oil-burning boilers, with sufficient range to operate with the battlecruiser Luchador once completed.

The increased size of the ship happens to allow for an additional 140mm gun forward, and two 65mm anti-airship guns are installed aft.

Two units are planned for 1910.



Grenada, laid down 1910, engine 1909

Displacement:
   4,111 t light; 4,273 t standard; 4,975 t normal; 5,536 t full load

Dimensions: Length overall / water x beam x draught
   461.38 ft / 459.32 ft x 45.93 ft x 19.19 ft (normal load)
   140.63 m / 140.00 m x 14.00 m  x 5.85 m

Armament:
      4 - 5.51" / 140 mm guns in single mounts, 83.72lbs / 37.97kg shells, 1907 Model
     Breech loading guns in deck mounts with hoists
     on centreline ends, evenly spread, 2 raised mounts - superfiring
      2 - 5.51" / 140 mm guns in single mounts, 83.72lbs / 37.97kg shells, 1907 Model
     Breech loading guns in deck mounts with hoists
     on centreline, all amidships, all raised mounts - superfiring
      2 - 2.56" / 65.0 mm guns in single mounts, 8.38lbs / 3.80kg shells, 1907 Model
     Quick firing guns in deck mounts
     on side, all amidships
      4 - 0.31" / 8.0 mm guns in single mounts, 0.02lbs / 0.01kg shells, 1907 Model
     Machine guns in deck mounts
     on side, evenly spread
   Weight of broadside 519 lbs / 235 kg
   Shells per gun, main battery: 200
   8 - 18.0" / 457 mm above water torpedoes

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   2.95" / 75 mm   347.77 ft / 106.00 m   8.14 ft / 2.48 m
   Ends:   0.98" / 25 mm   111.55 ft / 34.00 m   8.14 ft / 2.48 m
     Main Belt covers 116 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.98" / 25 mm   0.98" / 25 mm      2.95" / 75 mm
   2nd:   0.98" / 25 mm   0.98" / 25 mm      2.95" / 75 mm
   3rd:   0.98" / 25 mm         -               -
   4th:   0.47" / 12 mm         -               -

   - Armour deck: 1.18" / 30 mm, Conning tower: 2.95" / 75 mm

Machinery:
   Coal and oil fired boilers, steam turbines,
   Direct drive, 4 shafts, 32,000 shp / 23,872 Kw = 27.48 kts
   Range 10,000nm at 10.00 kts (Bunkerage = 1,264 tons)

Complement:
   296 - 385

Cost:
   £0.411 million / $1.643 million

Distribution of weights at normal displacement:
   Armament: 65 tons, 1.3 %
   Armour: 713 tons, 14.3 %
      - Belts: 372 tons, 7.5 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 33 tons, 0.7 %
      - Armour Deck: 289 tons, 5.8 %
      - Conning Tower: 19 tons, 0.4 %
   Machinery: 1,517 tons, 30.5 %
   Hull, fittings & equipment: 1,748 tons, 35.1 %
   Fuel, ammunition & stores: 863 tons, 17.4 %
   Miscellaneous weights: 69 tons, 1.4 %
    -25 t:  Wireless
    -8 t:  Torpedoes
    -36 t:  Weight reserve

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     4,689 lbs / 2,127 Kg = 56.0 x 5.5 " / 140 mm shells or 0.9 torpedoes
   Stability (Unstable if below 1.00): 1.25
   Metacentric height 2.3 ft / 0.7 m
   Roll period: 12.6 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.31
   Seaboat quality  (Average = 1.00): 1.28

Hull form characteristics:
   Hull has rise forward of midbreak
   Block coefficient: 0.430
   Length to Beam Ratio: 10.00 : 1
   'Natural speed' for length: 21.43 kts
   Power going to wave formation at top speed: 52 %
   Trim (Max stability = 0, Max steadiness = 100): 55
   Bow angle (Positive = bow angles forward): 5.00 degrees
   Stern overhang: -3.28 ft / -1.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      23.62 ft / 7.20 m
      - Forecastle (20 %):   19.69 ft / 6.00 m
      - Mid (40 %):      19.69 ft / 6.00 m (11.81 ft / 3.60 m aft of break)
      - Quarterdeck (15 %):   11.81 ft / 3.60 m
      - Stern:      11.81 ft / 3.60 m
      - Average freeboard:   15.28 ft / 4.66 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 111.1 %
      - Above water (accommodation/working, high = better): 98.1 %
   Waterplane Area: 13,248 Square feet or 1,231 Square metres
   Displacement factor (Displacement / loading): 115 %
   Structure weight / hull surface area: 76 lbs/sq ft or 372 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.96
      - Longitudinal: 1.56
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is adequate
   Room for accommodation and workspaces is adequate
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

[The Rock Doctor]

Oh yes, and there's another six torpedo boats - another incremental improvement on the preceding L class, but with a layout akin to the dispatch boat.  I'll get to drawing this one out later.

N-Class Torpedo-boat, laid down 1909

Displacement:
   750 t light; 776 t standard; 861 t normal; 930 t full load

Dimensions: Length overall / water x beam x draught
   280.48 ft / 278.87 ft x 26.57 ft x 10.17 ft (normal load)
   85.49 m / 85.00 m x 8.10 m  x 3.10 m

Armament:
      3 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1909 Model
     Breech loading guns in deck mounts with hoists
     on centreline ends, majority aft, 1 raised mount aft
      2 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1909 Model
     Quick firing guns in deck mounts with hoists
     on side, all amidships
      2 - 0.31" / 8.0 mm guns in single mounts, 0.02lbs / 0.01kg shells, 1909 Model
     Machine guns in deck mounts
     on side, evenly spread, all raised mounts
   Weight of broadside 68 lbs / 31 kg
   Shells per gun, main battery: 200
   4 - 18.0" / 457 mm above water torpedoes

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.98" / 25 mm         -         0.98" / 25 mm
   2nd:   0.98" / 25 mm         -         0.98" / 25 mm

Machinery:
   Coal and oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 18,000 shp / 13,428 Kw = 29.67 kts
   Range 3,000nm at 10.00 kts (Bunkerage = 154 tons)

Complement:
   79 - 103

Cost:
   £0.099 million / $0.395 million

Distribution of weights at normal displacement:
   Armament: 8 tons, 1.0 %
   Armour: 8 tons, 0.9 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 8 tons, 0.9 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 0 tons, 0.0 %
   Machinery: 466 tons, 54.1 %
   Hull, fittings & equipment: 242 tons, 28.0 %
   Fuel, ammunition & stores: 111 tons, 12.9 %
   Miscellaneous weights: 26 tons, 3.0 %
     -10/5 t:  Wireless (lead unit/other units)
     -6 t:  Torpedoes
     -10/15 t:  Weight reserve (lead unit/other units)

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     208 lbs / 95 Kg = 15.4 x 3.0 " / 76 mm shells or 0.2 torpedoes
   Stability (Unstable if below 1.00): 1.24
   Metacentric height 1.0 ft / 0.3 m
   Roll period: 11.1 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.25
   Seaboat quality  (Average = 1.00): 1.04

Hull form characteristics:
   Hull has rise forward of midbreak
   Block coefficient: 0.400
   Length to Beam Ratio: 10.49 : 1
   'Natural speed' for length: 16.70 kts
   Power going to wave formation at top speed: 66 %
   Trim (Max stability = 0, Max steadiness = 100): 67
   Bow angle (Positive = bow angles forward): 5.00 degrees
   Stern overhang: -1.64 ft / -0.50 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      18.37 ft / 5.60 m
      - Forecastle (20 %):   15.75 ft / 4.80 m
      - Mid (45 %):      15.75 ft / 4.80 m (7.87 ft / 2.40 m aft of break)
      - Quarterdeck (15 %):   7.87 ft / 2.40 m
      - Stern:      7.87 ft / 2.40 m
      - Average freeboard:   11.63 ft / 3.54 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 185.8 %
      - Above water (accommodation/working, high = better): 87.2 %
   Waterplane Area: 4,562 Square feet or 424 Square metres
   Displacement factor (Displacement / loading): 46 %
   Structure weight / hull surface area: 26 lbs/sq ft or 127 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 1.84
      - Overall: 0.57
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is cramped
   Ship has slow, easy roll, a good, steady gun platform